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Composite protection method for magnesium-lithium alloy surface and special epoxy/nano SiO2 paint

A magnesium-lithium alloy and surface compounding technology, which is applied in epoxy resin coatings, devices for coating liquid on the surface, and surface pretreatment, etc., can solve the problems of large equipment investment, difficult operation, and complicated treatment process, and achieve corrosion potential Improvement, reduction of corrosion current, and improvement of corrosion resistance

Inactive Publication Date: 2011-01-26
苏州嘉祥树脂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method provided in the patent document with the application number 200810064145.2 requires micro-arc oxidation treatment equipment, which requires large equipment investment and high technical requirements; the method provided in the patent document with the application number 200710072296.8 needs to be heated to 150-350°C and protected by argon special treatment furnace, the treatment process is complicated, and it is not easy to operate
Moreover, the three treatment technologies are all single protective treatment methods, and the improvement of anti-corrosion performance is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. New epoxy / nano SiO 2 Coating synthesis: 1) Dry the epoxy resin after water removal, and add modifier—(γ-isocyanato)propyltriethoxysilane under stirring at 60°C, the mass ratio of epoxy resin and modifier is 100:3, react for 4 hours, make the hydroxyl group of the epoxy resin macromolecule react with the isocyanate group, graft the compound of alkoxy silicon on the epoxy resin macromolecule, and make the modified epoxy resin; 2) orthosilicic acid Ethyl ester, water, and ethanol are mixed uniformly according to the molar ratio of 1:4:15, adjusted to pH 9 with acid or alkali, stirred and reacted at 45°C for 24 hours, and nano-SiO 2 Precursor; 3) Dilute the modified epoxy resin with tetrahydrofuran and N-methyl-2-pyrrolidone, according to the modified epoxy resin and nano-SiO 2 The mass ratio is a ratio of 100:3, and the modified epoxy resin is added to the nano-SiO 2 In the precursor, react for 5 hours at 50°C to synthesize a new type of epoxy / nano-SiO 2 coating.

...

Embodiment 2

[0026] 1. New epoxy / nano SiO 2 Coating synthesis: 1) Dry the epoxy resin after water removal, and add modifier—(γ-isocyanato)propyltriethoxysilane under stirring at 55°C, the mass ratio of epoxy resin and modifier is 100:2, react for 5 hours, make the hydroxyl group of the epoxy resin macromolecule react with the isocyanate group, graft the compound of alkoxy silicon on the epoxy resin macromolecule, and make the modified epoxy resin; 2) orthosilicic acid Ethyl ester, water, and ethanol are mixed uniformly according to the molar ratio of 1:3:12, adjusted to pH 9.5 with acid or alkali, stirred and reacted at 45°C for 20 hours, and nano-SiO 2 Precursor; 3) Dilute the modified epoxy resin with tetrahydrofuran and N-methyl-2-pyrrolidone, according to the modified epoxy resin and nano-SiO2 The mass ratio is a ratio of 100:5, and the modified epoxy resin is added to the nano-SiO 2 In the precursor, react at 45°C for 6 hours to synthesize a new type of epoxy / nano-SiO 2 coating.

...

Embodiment 3

[0032] 1. New epoxy / nano SiO 2 Coating synthesis: 1) Dry the epoxy resin after water removal, and add modifier—(γ-isocyanato)propyltriethoxysilane under stirring at 50°C, the mass ratio of epoxy resin and modifier is 100:2, react for 8 hours, make the hydroxyl group of the epoxy resin macromolecule react with the isocyanate group, graft the compound of alkoxy silicon on the epoxy resin macromolecule, and make the modified epoxy resin; 2) orthosilicic acid Ethyl ester, water, and ethanol are mixed uniformly according to the molar ratio of 1:4:10, adjusted to pH 8.5 with acid or alkali, stirred and reacted at 50°C for 24 hours, and nano-SiO 2 Precursor; 3) Dilute the modified epoxy resin with tetrahydrofuran and N-methyl-2-pyrrolidone, according to the modified epoxy resin and nano-SiO 2 The mass ratio is a ratio of 100:2, and the modified epoxy resin is added to the nano-SiO 2 In the precursor, react for 7 hours at 45°C to synthesize a new type of epoxy / nano-SiO 2 coating. ...

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PUM

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Abstract

The invention provides a composite protection method for a magnesium-lithium alloy surface and a special epoxy / nano SiO2 paint. The method comprises the following steps: synthesizing a novel epoxy / nano SiO2 paint; pretreating the surface of the magnesium-lithium alloy; carrying out phytic acid conversion on the surface of the magnesium-lithium alloy to form a phytic acid conversion film on the surface of the magnesium-lithium alloy; and coating and compounding the epoxy / nano SiO2 paint on the phytic acid conversion film of the magnesium-lithium alloy. The introduction of nano SiO2 is beneficial to improving the corrosion resistance of the epoxy paint. At the same time, the unimolecular organic film layer formed by phytic acid conversion and the coating formed from the epoxy / nano SiO2 paint have similar chemical properties, and the cohesive properties of the both are enhanced, thereby being beneficial to forming a stable and compact protective layer on the surface of the magnesium-lithium alloy to have a dual protection effect on the magnesium-lithium alloy and further improving the corrosion resistance of the magnesium-lithium alloy. Thus, the corrosion potential of the magnesium-lithium alloy is increased by 0.8-1.2VSCE, and the corrosion current is reduced by 4-6 orders of magnitude.

Description

technical field [0001] The invention relates to an alloy surface protection treatment technology, in particular to a magnesium-lithium alloy surface composite protection treatment method. The present invention also relates to a kind of epoxy / nano-SiO used for composite protection of magnesium-lithium alloy surface 2 coating. Background technique [0002] Magnesium-lithium alloy is a new type of ultra-light metal structure material. Its main characteristics are: low density, high unit elastic modulus, high compressive yield limit, good impact toughness, high bending strength, and high penetration resistance of high-energy particles. , Large damping, can absorb impact energy, good vibration and noise reduction effect, good plasticity, easy deformation processing, easy welding and forming, etc. However, magnesium-lithium alloys are active in chemical properties and are prone to chemical or electrochemical reactions with the surrounding environment, resulting in poor corrosion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/14B05D3/00C23C22/07C09D163/00C09D7/12
Inventor 张春红张密林黄晓梅高丽丽
Owner 苏州嘉祥树脂有限公司
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